Buggy code:
@ Service public class UserServiceImpl implements UserService { private final Logger log = LoggerFactory . getLogger ( getClass ( ) ) ; private TransactionTemplate transactionTemplate ; private UserDao userDao ; private AccessTokenDao accessTokenDao ; private RefreshTokenDao refreshTokenDao ; private PasswordEncoder passwordEncoder ; private AuthenticationManager authenticationManager ; private long accessTokenLifetime ; private long refreshTokenLifetime ; private String debugToken ; @ Autowired public void setTransactionManager ( PlatformTransactionManager aTransactionManager ) { } @ Autowired public void setUserDao ( UserDao aUserDao ) { } @ Autowired public void setAccessTokenDao ( AccessTokenDao aAccessTokenDao ) { } @ Autowired public void setRefreshTokenDao ( RefreshTokenDao aRefreshTokenDao ) { } @ Autowired public void setPasswordEncoder ( PasswordEncoder aPasswordEncoder ) { } @ Autowired @ Qualifier ( "authenticationManager" ) public void setAuthenticationManager ( AuthenticationManager aAuthenticationManager ) { } @ Value ( "${user.accessTokenLifetime}" ) public void setAccessTokenLifetime ( long aAccessTokenLifetime ) { } @ Value ( "${user.refreshTokenLifetime}" ) public void setRefreshTokenLifetime ( long aRefreshTokenLifetime ) { } @ Value ( "${user.debugToken}" ) public void setDebugToken ( String aDebugToken ) { } @ Override @ Transactional ( readOnly = true ) public User getById ( Long aId ) { } @ Override @ Transactional ( readOnly = true ) public User getByEmail ( String aEmail ) { } @ Override @ Transactional ( readOnly = true ) public Page < User > getAll ( Pageable aPageable ) { } @ Override @ Transactional ( rollbackFor = { UserExistsException . class } ) public User create ( User aUser ) throws UserExistsException { } @ Override @ Transactional ( rollbackFor = { UserNotFoundException . class , UserExistsException . class , SelfRoleModificationException . class } ) public User update ( final User aUser , String aNewPassword ) throws SelfRoleModificationException , UserExistsException , UserNotFoundException { } @ Override @ Transactional public void delete ( Long aId ) throws SelfDeletionException , UserNotFoundException { } @ Override @ Transactional public Authentication authenticate ( String aEmail , String aPassword ) throws InvalidCredentialsException { } @ Override @ Transactional public void authenticateToken ( String aToken ) throws InvalidTokenException { } @ Override @ Transactional public Authentication refreshToken ( String aRefreshToken ) throws InvalidTokenException { } @ Override @ Transactional public User logout ( String aToken ) throws InvalidTokenException { } @ Override @ Transactional public User getAuthenticatedUser ( ) throws NotAuthenticatedException { } @ Override @ Transactional ( rollbackFor = { NotAuthenticatedException . class , NotAuthorizedException . class , InvalidPasswordException . class , UserNotFoundException . class , UserExistsException . class , SelfRoleModificationException . class } ) public User updateAuthenticatedUser ( User aUser , String aOldPassword , String aNewPassword ) throws InvalidPasswordException , NotAuthenticatedException , NotAuthorizedException , SelfRoleModificationException , UserExistsException , UserNotFoundException { } @ Override @ Transactional public void cleanTokens ( ) { } private AccessToken createAccessToken ( UserServiceImpl . TokenString aToken , User aUser ) { } private RefreshToken createRefreshToken ( UserServiceImpl . TokenString aToken , User aUser ) { } private void validateTokenAge ( BaseToken aToken , long aLifetime ) throws InvalidTokenException { long tokenAge = ( ( new Date ( ) . getTime ( ) ) - ( aToken . getDate ( ) . getTime ( ) ) ) // 1000 ; if ( tokenAge > aLifetime ) { <START_BUG> log . debug ( ( ( ( ( ( ( ( ( "Token<seq2seq4repair_space>" + aToken ) + "<seq2seq4repair_space>is<seq2seq4repair_space>too<seq2seq4repair_space>old<seq2seq4repair_space>[" ) + aToken ) + "],<seq2seq4repair_space>age<seq2seq4repair_space>is<seq2seq4repair_space>[" ) + tokenAge ) + "],<seq2seq4repair_space>lifetime<seq2seq4repair_space>is<seq2seq4repair_space>[" ) + aLifetime ) + "]." ) ) ; <END_BUG> throw new InvalidTokenException ( ) ; } } private AccessToken getAccessTokenByString ( String aTokenString ) throws InvalidTokenException { } private RefreshToken getRefreshTokenByString ( String aTokenString ) throws InvalidTokenException { } private Date getTokenExpiration ( BaseToken aToken ) { } private class AuthenticationImpl implements Authentication { private String accessToken ; private Date accessTokenExpiration ; private String refreshToken ; private Date refreshTokenExpiration ; private User user ; @ Override public String getAccessToken ( ) { } public void setAccessToken ( String aAccessToken ) { } @ Override public Date getAccessTokenExpiration ( ) { } public void setAccessTokenExpiration ( Date aAccessTokenExpiration ) { } @ Override public String getRefreshToken ( ) { } public void setRefreshToken ( String aRefreshToken ) { } @ Override public Date getRefreshTokenExpiration ( ) { } public void setRefreshTokenExpiration ( Date aRefreshTokenExpiration ) { } @ Override public User getUser ( ) { } public void setUser ( User aUser ) { } } private static class TokenString { private String tokenId ; private String tokenSecret ; public TokenString ( ) { } public TokenString ( String aTokenId , String aTokenSecret ) { } public String getTokenId ( ) { } public String getTokenSecret ( ) { } public String toString ( ) { } public static UserServiceImpl . TokenString valueOf ( String aString ) throws InvalidTokenException { } } }

Fix:
log . debug ( ( ( ( ( ( ( "Token<seq2seq4repair_space>is<seq2seq4repair_space>too<seq2seq4repair_space>old<seq2seq4repair_space>[" + aToken ) + "],<seq2seq4repair_space>age<seq2seq4repair_space>is<seq2seq4repair_space>[" ) + tokenAge ) + "],<seq2seq4repair_space>lifetime<seq2seq4repair_space>is<seq2seq4repair_space>[" ) + aLifetime ) + "]." ) ) ;